Cattle Feed and Digestion. 151 



siderable bulk in feed is necessary to give the natural pro- 

 portion or size of parts in growing animals, for the reasons 

 advanced, bulk in feed, air, and blood become a perma- 

 nent necessity to maintain size in the body, in the lungs, 

 and in the entire system of the blood-vessels that convey 

 alimentary matters to all parts of the body structure. 



